In this article I will guide you step by step how to install Metal Roofing over Shingles? Metal roofing has become a popular choice for residential properties due to its durability, energy efficiency, and modern aesthetic. While it is possible to install metal roofing over existing asphalt shingles, it isn’t always the best solution. At Pete’s Builders, we believe in empowering homeowners with the information they need to make informed decisions about their roofing projects.

Can You Install Metal Roofing Over Shingles?

Yes, it is possible to install metal roofing over shingles under certain conditions. If the shingles are nearing the end of their lifespan but remain flat, uncracked, and intact, the removal process may be skipped, saving up to 25% on labor and disposal costs.

However, while this may seem cost-effective, Pete’s Builders generally advises against this practice due to potential long-term complications. Here’s why:

4 Key Considerations Before Installing Metal Roofing Over Shingles

1. Roof Decking Inspection is Skipped

• What’s missed? The roof decking, typically made of wood, serves as the foundation for your roof. During a complete shingle removal, the decking is inspected for issues such as rot or structural weakness.
• The problem: If this inspection is skipped, hidden problems may go unnoticed, leading to decreased energy efficiency and higher repair costs in the future. The added weight of metal roofing can also stress an already compromised structure.

2. Weak Roofs Become Weaker

• Shingles and underlayers have a set lifespan. Placing metal roofing over worn-out shingles doesn’t address existing weaknesses.
• Risks: Water can seep between the layers, creating conditions for dampness, rot, and mold growth.

3. Leak Detection Becomes Difficult

• Metal roofing over shingles makes leak identification more challenging. Water may penetrate the old shingle roof unnoticed, causing damage to the interior structure.
• Repair issues: Addressing leaks requires removing both roofing layers, making repairs more complex and costly.

4. Key Roofing Components May Be Overlooked

• Without tearing off the shingles, certain vital components may not be installed or replaced:
  • Underlayment: A specialized underlayment for metal roofing is essential for moisture protection, but old shingle underlayment may not suffice.
  • Flashing: This protects roof edges and areas prone to leaks. Reusing old flashing often leads to poor fits and water leakage.
• Why it matters: Starting with a clean deck ensures proper installation of all components for maximum durability.

Should You Install a Metal Roof Over Shingles?

While it is technically possible, we rarely recommend installing metal roofing over shingles. This method might save initial costs, but it often leads to:

• Hidden structural issues
• Increased likelihood of water leaks
• Higher long-term repair and maintenance costs

At Pete’s Builders, we advocate for a complete roof replacement to ensure safety, functionality, and longevity. Removing all existing components allows for a clean installation, protecting your investment for decades to come.

FAQs About Metal Roofing Over Shingles

1. Can metal roofing be installed over any shingle roof?

No, shingles must be flat, uncracked, and blister-free. The underlying decking must also be structurally sound.

2. Is installing metal roofing over shingles cheaper?

Yes, it may save up to 25% on labor and disposal costs. However, potential future repair expenses may outweigh these savings.

3. How long does metal roofing last?

With proper installation and maintenance, metal roofs can last 50–70 years or more.

4. Do metal roofs require special underlayment?

Yes, metal roofs need underlayment specifically designed for their properties. Old shingle underlayment is often inadequate.

5. Should I hire a professional for metal roof installation?

Absolutely. Professional roofers ensure proper inspection, installation, and adherence to best practices for a durable and efficient roof.

Conclusion

Installing a metal roof over shingles may seem like an economical solution, but it often results in water leaks, structural damage, and increased maintenance costs. At Pete’s Builders, we prioritize lasting quality and recommend a full roof replacement to prevent future issues.

If you’re planning a metal roof installation or need expert guidance, reach out to Pete’s Builders. Our team specializes in durable roofing solutions designed to protect your home for years to come. Invest in quality roofing today—choose Pete’s Builders!